TagPart 150(262)

This document presents the opening materials from a December 13, 2023 StART (Stakeholder Advisory Round Table) meeting for the Seattle-Tacoma International Airport Part 150 Study, a federally guided process for assessing and managing aircraft noise impacts. The study is being conducted by ESA, an environmental aviation consultancy with experience at more than 180 airports nationwide and over 25 completed Part 150 Studies. The meeting introduced the ESA project management team and outlined the firm's qualifications for leading Sea-Tac's noise compatibility planning effort.

This technical memorandum, prepared by Leigh Fisher for the Port of Seattle in September 2023, provides an updated aviation activity forecast for Seattle-Tacoma International Airport as part of a FAA Part 150 noise study. It outlines forecast and operational assumptions—including projected aircraft types and flight activity levels—that were used to model future noise conditions around Sea-Tac. The report is accompanied by operational data appendices supporting the airport's long-term noise compatibility planning efforts.

Aviation noise consultant Vince Mestre explains to the Port of Seattle why changing the FAA's 65 DNL noise contour standard — the threshold used to determine acceptable aircraft noise near residential areas — would likely require an act of Congress rather than a simple regulatory update. The 65 DNL standard is embedded in at least three federal regulations and orders (CFR 14 Parts 150 and 161, and FAA Order 1050.1F), all of which trace their authority back to enabling legislation such as the Aviation Safety and Noise Abatement Act (ASNA) of 1978 and the Airport Noise and Capacity Act (ANCA) of 1990. Because the FAA's rulemaking authority is granted and bounded by those Congressional statutes, modifying ASNA would most likely be required before the FAA could formally lower or otherwise change the noise compatibility standard.

Resolution No. 3257 of the Port of Seattle Commission establishes the Mobile Home Airport Compatibility Program, which provides financial assistance of up to $12,000 per mobile home to help relocate residents from mobile home parks near Seattle-Tacoma International Airport that are being converted to airport-compatible land uses. Park owners who participate must grant an avigation easement to the Port, restrict future property use to airport-compatible purposes, and ensure residents receive an approved relocation plan. The program was created to implement Measure M2d of the 1993 FAR Part 150 Noise Remedy Program amendments, approved by the FAA in May 1994.

Minutes from a September 12, 2022 joint workshop between the Naples, Florida City Council and Naples Airport Authority cover discussions on the Airport Master Plan, noise reduction efforts, and community concerns about increasing jet traffic. Key topics included raising aircraft flight path ceilings to reduce noise, the possibility of reclassifying Naples as a Class C airport, and whether the Master Plan's growth projections were already outdated given a 40% surge in jet traffic. Residents and neighborhood association representatives called for equitable distribution of noise impacts and urged immediate action rather than waiting for a formal noise study to be completed.

This FAQ document from the Port of Seattle addresses common questions about noise management at Seattle-Tacoma International Airport, including how and when the third runway is used, why the Port cannot impose noise-based restrictions on runway operations, and what types of noise mitigation projects qualify for FAA funding. It outlines the history of the Port's noise reduction efforts, such as home acquisitions, insulation programs, and the Fly Quiet Incentive Program, and explains the goals of the Part 150 Noise Study process. The document also highlights the economic importance of Sea-Tac to the Puget Sound region while acknowledging the challenges of reducing noise in a densely populated area around a major international airport.